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<lcdpublishing@...> wrote: Nothing in the world is going to make a square wave show up square on a capacitively coupled sound card. And the capacitors are on the sound card, not in the probe. Still,

Use a couple of zeners in series, taking virtual ground from where the two connect. Then true ground is negative with respect to your new virtual ground. Be careful to set up the series current

Hi Just the way we have PC based scopes are there any PC based curve tracers available that one may purchase for there work ? I have been unable to find something I would like. Anny suggessions will

The voltage shown on the "Scope" is not actually accurate. It takes a bit of messing around to calibrate it based on the volumn control which is set in Windows (task bar), working from a known

seeing how you are ac coupled, dc blocked, it lookes to me like trigger pulses on and off. Don

<lcdpublishing@...> wrote: We kicked around the idea that both inputs to the sound card are coupled through capacitors to block the DC path. This circuit is also called a differentiator. For AC

First of all, thanks for everyone's quick responses. I thought using a voltage divider would take a toll on my 9V cell. Thanks for clearing that up. I don't really want to go the route of buying

Roy, Yes, there is a ground wire. Here is what I have for my 'Probe' which is based on a schematic in the documentation for the Soundcard scope. I have the cord from a PC microphone that is about 7

I bet you a soundcard the ground wire length is totally irrelevant there. I don't even want to speculate about that squiggle ;-) What is connected to the opamp output? Is ground connected? How looks

And a ground wire? That'll make a significant difference there. In fact my tek probes have both long and short ground wires for exactly that reason. That's some pretty extreme ringing, for one thing.

Some opamps work well from a single supply, and that is a preferable choice if you can get by with it. Or you can fool them with a resistor biasing scheme to work with a single supply (this is often

You can do that, and I've seen a bunch of stuff that does exactly that. The resistive divider can be fairly high values, like 10K for example, without causing much in the way of problems. This isn't

Shawn, Sounds as if you will need a tunable filter so you can select the various frequency components. 73, ron, n9ee/r <sstandfast@...> wrote: pro's small in reference know provide comparison >

John, If you are using AC then an op-amp can be run on a single supply. You have to put a voltage divider on the non-inv (+) input and drive the inv(-) side and AC couple the input and output with

You can add capacitors in parallel for better AC stability of the ground. Actively driving the ground with an opamp is another way. ST

I just upload a JPG image from my scope thing. It is located in FILES-CHRIS_LCD and it is called ON-OFF.JPG What you are seeing is measured at the output of an opto isolator (MT6) and the signal I was

Hello all. I've been experimenting with all sorts of opamp circuits. I was wondering what would be the best way to get a + and - rail from a battery. I was thinking that I could use a voltage divider

assumption. ST

Why do you say that the sound card would have low input impedance? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter